/// <summary>
/// Returns information about whether the given train has to stop before a German railway signal Ne1 (Trapeztafel),
/// before proceeding into the station; or if any other crossing train has to.
/// </summary>
public TrapezEntry TrapezAtStation(ITrain train, Station station)
{
var its = IntersectTrainsAtStations(train, station, true);
var days = Days.None;
var stoppingTrains = new List <ITrain>();
foreach (var it in its)
{
days = days.Union(it.Days);
if (it.GetArrDep(station).TrapeztafelHalt)
{
stoppingTrains.Add(it);
}
}
if (!its.Any()) // We had no intersecting train, so we should return the trains days itself.
{
days = Days.All;
}
return(new TrapezEntry(train.GetArrDep(station).TrapeztafelHalt, stoppingTrains.ToArray(), train.Days.IntersectingDays(days)));
}
private IEnumerable <ITrain> IntersectTrainsAtStations(ITrain ot, Station s, bool crossing)
{
var probeTrainStart = ot.GetArrDep(s).Arrival;
var probeTrainEnd = ot.GetArrDep(s).Departure;
if (probeTrainStart == TimeEntry.Zero || probeTrainEnd == TimeEntry.Zero)
{
yield break;
}
// Prepare matching criteria for trains collection
Func <ITrain, bool> pred;
if (tt.Type == TimetableType.Linear)
{
pred = t => t.Direction == ot.Direction; // Overtaking
if (crossing)
{
pred = t => t.Direction != ot.Direction; // Crossing
}
}
else
{
var surrounding = new TrainPathData(tt, ot).GetSurroundingStations(s, 1);
pred = t =>
{
var p = new TrainPathData(tt, t).GetSurroundingStations(s, 1);
var x = new int[p.Length];
for (int i = 0; i < p.Length; i++)
{
x[i] = Array.IndexOf(surrounding, p[i]);
}
// We have only one station in common (the center station), this is definitely a crossing (from another route)
if (x.Count(i => i >= 0) < 2)
{
return(crossing);
}
var compare = x.FirstOrDefault().CompareTo(x.LastOrDefault());
return(crossing ? compare > 0 : compare < 0);
};
}
foreach (var train in tt.Trains.Where(pred))
{
if (train == ot || !train.GetPath().Contains(s))
{
continue;
}
var ardp = train.GetArrDep(s);
var curTrainStart = ardp.Arrival;
var curTrainEnd = ardp.Departure;
if (curTrainStart == TimeEntry.Zero || curTrainEnd == TimeEntry.Zero)
{
continue;
}
var st = probeTrainStart < curTrainStart ? curTrainStart : probeTrainStart;
var en = probeTrainEnd < curTrainEnd ? probeTrainEnd : curTrainEnd;
var isCrossing = st <= en;
if (isCrossing && ot.Days.IsIntersecting(train.Days))
{
yield return(train);
}
}
}
